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Reconciliation of Income Tax Expense (Benefit) Computed by Applying U.S. Statutory Federal Income Tax Rate against Income (Loss) before Income Taxes to Provision (Benefit) for Income Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended
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May 31, 2018 | May 31, 2017 | May 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Income tax expense at the U.S. statutory federal income tax rate | $ 121,812 | $ 85,517 | $ 169,213
Impact of foreign operations | (16,276) | (20,156) | (29,969)
State and local income taxes, net | 9,520 | 4,734 | 4,310
Domestic manufacturing deduction | (4,839) | (2,537) | (8,030)
Nondeductible business expense | 2,473 | 2,394 | 2,224
Valuation allowance | (5,235) | 933 | (3,357)
Deferred tax liability for unremitted foreign earnings | (77,970) | (621) | (3,712)
Non-taxable gain from joint venture |  |  | (2,790)
Other | 737 | 1,476 | (1,881)
Equity-based compensation | (4,652) | (12,078) |
Transition tax liability | 67,899 |  |
Remeasurement of U.S. deferred income taxes | (15,678) |  |
Provision for Income Taxes | $ 77,791 | $ 59,662 | $ 126,008
Effective Income Tax Rate | 18.70% | 24.40% | 26.10%

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